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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685fa77c14e45909d621a4bf23537a66c0161d3cb0a7cca931591f8105074be2' 
  AND token = 'afEgXIo/FooG5WPAyniYtCm1686Z+ZENQzPKc1PJRKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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