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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3289f4b836851276fc639550e82549c950fe0e05189061562512b2e32731e859' 
  AND token = 'v0nZGkUYzZkMY5jxOIBhHyU807yaVlXU3mKvyBRKZyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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