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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a817a12141f6d122846ed1dba07b9189a6406762d1943d85da68e878e7fc40' 
  AND token = 'L8KTe+cm+HBgOK7NEEFeLvEPNU8Rckp8MiU2+fBDJ9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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