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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f7e7d32ab6a5911b0196c8f2e3c32f517807e857e8b6dd0a2e66d9844544ac' 
  AND token = 'ggd7DI1omCmHrRT0BGGzA+wtqLNxLRt+AAP5atmFLOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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