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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f651564c7a96446354fee3ef56da38284b5d7cc6438f11f9b2d58d943cd869c' 
  AND token = 'm3ajtlfzyD0/R8S9I269wTAqmddb40iEDGTTTVmS30Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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