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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62b1b9648eac93230a70a754ca9d69dc3e317c8b52d2b6aeb501b4f6c35ece7' 
  AND token = 'DYifo7vzKcksbMoSFHkRLR6646DKFr0GuccH7QaHRi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}