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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5adfb710cc3b1d47fa6106ec67c068c5b064c9be1b9569780794d6513037635f' 
  AND token = '0FdszXRp64ZwZuu6Ikl327m0eI+cAiCqN6dQcKEwIEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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