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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf94488af89be17f6b7020b91e082fb8e2e8dafc09bcd5e027619d95d5a2a58' 
  AND token = '3KgO3nUqtrWDLy83MfKztapGtopDuo+ff9wXC0WCuS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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