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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcce5b98d4badc783f62f31efdcf536b07992c6e54691f58ef71198fb39b6e84' 
  AND token = 'In6h0dic+27Yh4cPxHhdqGi8lGZU6KHg4ed/j/auWEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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