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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987b245dd7b3bd9f26de3ef333fe27a36adcae6571c370931d4f712dc45e22df' 
  AND token = 'RhmCd3PA2ZtVNhomJG2gbOoSC5EpmvgXcvbZ14hvu4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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