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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ee57b61931f9d35e75962f96b6716641c29126b6b884f704990b6597031b88' 
  AND token = '86ZV7zQb84YKAjTLfeU/0PMC82e8pg5IaEIK0LqGrlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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