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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc25762ae72c19e80ac754a2dcf5770ecb76eb02f0292df3d69f69c507362804' 
  AND token = 'D77owHrRRGKpNbbeGamFb+sp8l3ytuFiz7iqCXuwo5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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