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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7379f59d3b8523aeae8ba89d3e6a66b914f5cd3ef879543538f0758caa3f703' 
  AND token = 'hjlVYuatXK755bCLAvrWqighwG4xapxEzWNsu4nMp0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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