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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e9398a01de3e3759bcdbc0890f20d75ce96e52931bd4a70f66c7c5a74614cc' 
  AND token = 'OLr7dPWobyLl/EYqWDw/y5KkSsCcMTNYY9DKJHDCBfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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