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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39eef8d32e7c2700cfb6e222c51dc8d0338c1b3ee2507d0015e8bcebaba1ea5f' 
  AND token = 'W1mkqLsuymyevJETTrXo7tGCY2QhAwIBNt6k0Xo0zyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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