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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e3160135cc265971622876c15d8d715d2894c72dc241b5ec248e91c2647aab' 
  AND token = 'T0/yYhlDhSf4IVl8HahTc3nzqQilKh6vlhFOF8nFhlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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