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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000907cdebbdd7787601fc78f162ded15dcfbb9ed26b96f968659134d0ef295a' 
  AND token = 'DAmOHIKy036kG0ZtcdeOtMjOCVjE1VWrO7oICwM4xxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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