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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcba7c2f1f3a869c4c917bd42434e9b8d175d8788c432a646fd69afbaa475f62' 
  AND token = '3dqcJWwRi4tLaCKLYacduz7BfurB2yCiGrsR9Yt2Zx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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