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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5c25d72c55c3e2d8c3507ca4300c871d61b53c8e1c8fc964f210f155f609c8' 
  AND token = 'R6zEztwiKcIa+YHQp4+T0o9hv9IEYlXF2xEgkLMKNGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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