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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd56306ebd8e66c6fb1f7f656c036f9e1a9f3e71e8d6d0c7e5a50312ec94bcda' 
  AND token = 'yK3PT4tbf2TFY1LBQFYN1QVPWvei1ScvKN1sc+EQRDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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