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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a156ad10c8f9e1f60a5e1e18c1cd26855dc04c8fde1da4ef6250d73f150d5ea4' 
  AND token = 'sgaULIdlTmUkC4R2n3ngDx9OeXeCrox8CsNRAWgaIxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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