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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8708f557411b71de5b088a71387129c2e24ffe263d8621b03e87e187f4c562' 
  AND token = '8nOl3xguPLWhLZDmeFLoopgsOdgYDs4kUkjvD+9E6Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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