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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e135a59cc1d48ef31c291c860a055306e45ed8cb4f00802fd6d3553e63fffc4f' 
  AND token = 'd+n3Qdvkdo8bXdJGXY3YlnZ51v2VEGV5W+yCI355SAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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