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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba1d43b8abf1183e8fcd4985ba084179f37b18eb7576de919e372b6d7045149' 
  AND token = 'Kj0Hr4i5IjfvMmBdVZ3NtBr04KWljXJSoj0BuTuFf8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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