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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f0092a5712e91036ef5f04f9caf64de89d94d4a48169a033474f1aeb912d91' 
  AND token = 'pK9v6Cje27VyLITnWJ+WdT+iFSQc0TQ8kX5wyBHnSVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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