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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96cca6a44d66f3d97f74095b9266deaeef3a68e2352c1893a1920148076422be' 
  AND token = 'aoTd+gbXoIj2KG0wBF7Ty4hUecDMx70afPTPz34zG2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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