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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71c38c83dece0c9f74fd252584281862a69fd821804e7791f8ca35eb3aafb17' 
  AND token = 'sY8REMv9uUMkCGBHVPdN3Zf2P1UcSTfGBCGpsQAXbYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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