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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ca886c4887dd6c894330764d742d86c8dd20e8eee8391abc75cd22e25d2b11' 
  AND token = 'dPg2Ry0deDj9gSqasVbND5mu/GUm/8gwVrYVckZMACU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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