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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0317332297a48baa993071ae9dec1eec094709179fd0c31ce6bc6b745f3cbf' 
  AND token = '5yWB0nEFsDVjggTWMszUkSvA6zlt8brYmkKIZODjOSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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