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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0744c5294b20a82dd26c876bcb07958cca7958a52097a69b5f1b6278c742f8' 
  AND token = 'gOvnNEYDxH+lpAkCATVVwml0Co7P9hQeN6ka3nnVoUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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