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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7db95458838a67b722b4ef88e1c153dd93b561fac60d0d63b08a539a4e5521' 
  AND token = '5F69PtyPIEyPANT3bf4ILIocgxNiA78QcE8UPeI09KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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