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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876c73872a6e303dda028a9820fce1587846272bc8caa31d93e2916c19bf46df' 
  AND token = 'Fi3f/3aPX0ppo9LiqCcPkqPdcIDTCy5cvOFARf7s4mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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