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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432f656ca803005fae1cfed95ea0d73871eed756e08315918d9e4cde209fe5c1' 
  AND token = 'YIvycbl1kucz9bD+XCBx6D3MEEB7+f+kQQ1OtWnuhFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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