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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92f0c6b614aca17de44ce71699690444829558a24d3619243012b03cc542f26' 
  AND token = '4bgWynKoTUKzDbzJTiE471KJHH99f9VwcAkE9U3RqUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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