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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8b8e2dce9171fcee5f90b1d435b62050c63a339af18bd4096865ab9b99b90f' 
  AND token = 'dT9G6oYjNDkAV8UyZyYvXXX9H+TrKcUjTwEpp6bsRis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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