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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a143d0b7b38991bb74fa17d92be1e8c10b39efd3e131fc8ebf247652c031e052' 
  AND token = 'vB7V991sUQZaelrPrbd2QDF0XpqnKecdV88dWAf/Cn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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