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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8efb2e470d1d1fd15a900da48e6fd5d8be1b2541a0acd93946b3f49593ca7de' 
  AND token = 'V5uhdB5yr8AoS6unZKeOPs1BQLnxl41kAn3XcTrHB8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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