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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f15ba85d653f8b71d7d142c7c20a9c35d7422b107740c5ce820e875b9e7ff03' 
  AND token = 'zo2jTWdwUa+Vkoxb3XiKwey+elpYMx7MMMM+jYfWMJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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