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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2aa6a0c236f202cefc596912ba6dc015073f2ba90b66c1bbe6eda84e5a32ae3' 
  AND token = 'gjPYdh7Qi06an4NRTxRJfABB9PvH6l/uGp6CFdvSk+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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