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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5595b5d44ac2c513512984864d7c4df6d7d346f4b697a1a12459b4322033fb13' 
  AND token = 'i6oTNg4TXgnHcVf9EpgOSu75fVTcAxzInVh4JtAkWEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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