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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9793bc04b8c66e7ef6038c18bb4344180961264fb53c4a66d5f2396c5feb862' 
  AND token = 'kcQth871ILXztGCGQvpxtMtozHBQ8vgG6IPByqDNWTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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