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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '458e581364e3af907e013feae06a7845c389a2354eac7239439c8475567485d9' 
  AND token = '6rRn+/OQbf/NwJMXeCtu4BUw9Wa/nnNJbzyChH8TnGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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