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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b74a03fa99352f1736e38aac67ccf2a5952b082da4c0fcddbe007283a9a9bb' 
  AND token = '7OngYOZy2tB51AlAdsLP+N2ONafg6Hb1nBFqHost4RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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