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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944175932877f0f381c3b8244cce83ed2aaad32b3f9dea2a90fdf9da6252725a' 
  AND token = 'iWGtmxleLqm5q7lYmLDyKaGsVLke6+ayvx6AOTfbA5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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