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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df1daf16d07d58698f9a0bb297f1a2434b096ae1a49887dc41026ff255a5a51' 
  AND token = 'kauY5doMp+/wN2iGbVqzW5rSWKHTdIM45oc04kt5+S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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