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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e7727406b3bb002d18682c8f3afd07573272cc97d566eb4fbbb33e96d7583b3' 
  AND token = 'oy6qNyC0JIJtqaX2rFhc/6Dkw2Dyh3h2c08QV3ZQuio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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