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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd917a462eaed5332857b8a531ce4ad5f0612efcbf64b3b446b0232a5b8574841' 
  AND token = 'rDgSxIjC2R4+lGf+K1ccTwSA1Rj+Bk072kkU5GlBPYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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