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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc131b1d1ada5be3e2e28a45de9420e8a5ee2e91462aef547b89c8cebf04b6d7' 
  AND token = 'DJePihIY9QOXtRSxNxPhF8JNVZS6mU0lv8SlwRDGMiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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