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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19bd16757742e820b8b1e1b789b0119ffc0326becfa97c4dd716e340bbd32fd' 
  AND token = 'hgyOeSyolTQcTv1CHXH6z3Wu/qGr4Gizvn0yjtlZD1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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