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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c8176a055cd19c86c03cb67b261bbfc0f3ea0e2625d131e0da02a42f564f3c' 
  AND token = 'UZwsr0c0wurocL6BCaNWDWIJaqSCaOM0GkXmLWKb3YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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