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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f52ef343d24cbfcd64a244a24747b5fc87051c3637958c3ada6e914eb49cf11' 
  AND token = 'qiqDguxq5W5NeoOqURBkcTOsv0HwE83d1+KK5mC4jQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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