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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44025f826616c5b2837346e0dbae132f9004a5044bbd05c0961856df7dc513af' 
  AND token = '9JA79AhrNaNaBfCIJv9WxQFDn/DvsWrI1LD3nY04DO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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