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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a77e576c2fe3c39edc66b1c4daf7748be65a5ce909ef0568355d9c1ae0e432' 
  AND token = 'WPsjKULC9KVUIsQXwPjWC3DIaIy9e6IO7WTB7jLWeRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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