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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b794a819b1237c2700c15370e487a44b0efecd6cf43f9a7e9cdd823db84c22c' 
  AND token = 'bq7pcXYVtF115kjG2lbAVW+XWmrvfS5NFPWNnWK92Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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