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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a254d1d7ad30005ae2fb6658a65de4b03d82b5956dae1b8d35a50276c590f1' 
  AND token = 'Kmopsce56hawoDu/tbTP0eilJhsgIo7Vuf63wi0y9V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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