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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56165f740c70f05f6c27968249351841327e722f593fdd6fa514d807096384f7' 
  AND token = 'Evx9F28G5KLIJ7gWmTDM8a5xHmbIOel6fTyK4hbu77A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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