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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a0863d740fe415669e46d0a2d59eee30958d8549aeda060cffd139753f5ec1' 
  AND token = 'f6uNBxPtI59SE+msaJHrfFfwn6/XpDqjzgQXF/Kghus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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