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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '413def59a3f85b9f7c0a225c9642879529141d202e2c836a103d3680d8e6f6b2' 
  AND token = '9BsMHZhRlLUHk8kgwP6rIVbBc2exGQxjxNPrBmfy3YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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