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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c066e5881d65e7cc96da22ae63fa3ef8639541882dafa73f3a533c27957cdd8e' 
  AND token = 'ZrTUu3voVVnPhivkaNg76TKUY0NaRpi1npiy9NFNuz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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