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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ee8ee5d0ed6899bcb4aa7708eaed0a6c4a6fb1e9f7beb083aa71e735a6f4fc' 
  AND token = '8Hf4UUsaxdqHPYKI0bDfgyNDVCVN+0iwTZgR5VOVoOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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