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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee85cbd532db1b3c3349e8d145852fd8fe9c4b62c25a3fb512d2c77ecdb44e4' 
  AND token = 'r026trmUNBiL+CFeedjvWQTa+Y7xEb1dHJEiAVeymrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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