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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76b99f32deef57a366e6efdf9b6622b6eaafa949c2d64dc3e09d3856963a356' 
  AND token = '1uudjk7g9SFskCf/1RDznPH77Htu/XP8NSBwBhDNtCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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