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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b57a3519bbdd6409c9687b92d6695fd4c3e1eb267499b1029249b02e9c9c09' 
  AND token = 'jszeGZWREx6ktyOIy1DVQFwhTGTV7vNFRtwJsX9Qpqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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