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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb8371825522326aebbabf83d3d87fd8dc3c407d032016abfbc58042719db6d' 
  AND token = 'BXdTFBMqfuWEZlC21f4/WrdcFWxO9VCAOwALu9AgIxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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