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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ae6b8307d2c4d16c95de0fa29df20ca381a43f12d324cccd8aeaa42228680e' 
  AND token = 'zNCJnrmw0W1MMAgLVhSTaKYVAlvHJjeLeeJXEP6hCig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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