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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925b55c5382eeaf147091d796e0727634ebae55e7f18923a9f70c3f2791a4b09' 
  AND token = 'DAH30eQGetbWRRCboWPJ4MctHsjVv5trWGKyyWBIUUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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