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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd3b29ca579df1f59dbb7fdc9825a2dff7e5bcefc7223340ef035113ba14668' 
  AND token = 'qwWNqOMUgO/2cqR06vOEhXeFaM9ZVTTLf69pWX0lwdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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