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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca02c6ab238b4c5d27b0e70256eea0f7ef30fee8a80c21e8a3a96d3a2e199697' 
  AND token = 'Lb8o8BunwOXjYhWi0sjS7c+4VtlZOL+ugbCItFE6o7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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