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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810dd4e62914cf8369318ff9dfc072f3fca5c919a29f9ecffe260caba5df6987' 
  AND token = 'AJu4IgfvedIbhF+Tz1FA+0Z6esG9GyCj3TtNR8UiPdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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