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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd75bac1efd61e0abf6caf655f44cb0a853fdc8ee049dc0d99f4155a35570c4' 
  AND token = 'wl9czaksoUpsajB4E2Cs40D8eJ7KxEGW4k6WjB6pMnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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