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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6742a894f9b7bd7033fa8baa9fc3ded9825f817e476a42148fe484d36a5c7a5' 
  AND token = 'g5wGMc60fj7tr0RNTbFQfUullWrR5dKG2JrnLmBe224=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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