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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed1fbe96ef39727dfd69e1c78cbbc5b10d3b8e542243647d404f9dbe20ba63a1' 
  AND token = 'EmMi35GiY/Na8p3a6AT99uadrSuPkF77PG7AYL9FrEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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